09 ram Hemi 186000 miles will not complete loop for inspection I recently replaced timing chain and missed a tooth on bottom, truck started ran no power so I tore back found mistake fixed truck has all the power but will not complete OB 2 test I get cat mon inc and oxygen sens mon inc have driving many drive cycles over last 2 months still same so I replaced both o2s on cats still the same battery is fairly new starts right up runs fine I'M LOST need any advice Will be greatly appreciated as my last resort i may take it to get flashed but have low confidence in dealer not real sure they know any more then I do cause all they say is you got to drive it well I have been over 1000 miles so that ain't it

 

Which monitor is not completing? Do you have the yes/no list from your inspection sheet? At 186K, there is probably something that isn't falling in range in the data, but not enough out to set a trouble code.

 

O2 sens mon and catalyst mon i have no codes Thanks

 

Original cats or aftermarket?


I've been down this aftermarket Hemi converter road many times.

 

all original equipment everything else will complete but those 2 I have checked wiring and found nothing corroded but put dielectric grease on all truck runs at about 195 mileage is a little off but may be due to lots of idling when i run graph on o2 they are all the same thanks again for you help

 

This was a 2008 Hemi truck with 2 aftermarket converters welded in. They can't flow the way OEM or high flow ones can. "Dead" OEM converters pretty much read the same way. It's a back pressure issue. Not enough to influence drivability, but enough to gas up the upstreams and level them out. As you can see in the graph, the upstreams are oscillating a little.


Now, this truck had the same graphs BEFORE he went somewhere and did aftermarkets. We tried to sell him the OEM assembly before he did that. We finally made a believer out of him.

 

So you are saying I may need new cats ? and have to buy oem ?

 

can cats just both go out all of the sudden ?

 

Do what you want. I don't have your truck in my possession. I do what I can from a keyboard. If the answer is not to your liking, choose another answer.

 

I was asking is that what you think not cutting it down